Add a uniqueID field to the FileStatus structure for Paths. This will map

to the inode number on Unix and something far less unique on Windows. The
windows case needs to be improved.

llvm-svn: 35461

2 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/System/Unix/Path.inc b/llvm/lib/System/Unix/Path.inc
index b155213ec62..5557282964e 100644
--- a/llvm/lib/System/Unix/Path.inc
+++ b/llvm/lib/System/Unix/Path.inc
@@ -375,6 +375,7 @@ Path::getFileStatus(FileStatus &info, bool update, std::string *ErrStr) const {
     status->mode = buf.st_mode;
     status->user = buf.st_uid;
     status->group = buf.st_gid;
+    status->uniqueID = uint64_t(buf.st_ino);
     status->isDir  = S_ISDIR(buf.st_mode);
     status->isFile = S_ISREG(buf.st_mode);
   }
diff --git a/llvm/lib/System/Win32/Path.inc b/llvm/lib/System/Win32/Path.inc
index 1f809ecfa56..f5edaa07edb 100644
--- a/llvm/lib/System/Win32/Path.inc
+++ b/llvm/lib/System/Win32/Path.inc
@@ -319,6 +319,13 @@ Path::getFileStatus(FileStatus &info, bool update, std::string *ErrStr) const {
     status->user = 9999;    // Not applicable to Windows, so...
     status->group = 9999;   // Not applicable to Windows, so...
 
+    // FIXME: this is only unique if the file is accessed by the same file path.
+    // How do we do this for C:\dir\file and ..\dir\file ? Unix has inode
+    // numbers, but the concept doesn't exist in Windows.
+    status->uniqueID = 0;
+    for (unsigned i = 0; i < path.length(); ++i)
+      status->uniqueID += path[i];
+
     __int64 ft = *reinterpret_cast<__int64*>(&fi.ftLastWriteTime);
     status->modTime.fromWin32Time(ft);